2 Unix SMB/CIFS implementation.
3 process incoming packets - main loop
4 Copyright (C) Andrew Tridgell 1992-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 struct timeval smb_last_time;
25 static char *InBuffer = NULL;
26 char *OutBuffer = NULL;
27 char *last_inbuf = NULL;
30 * Size of data we can send to client. Set
31 * by the client for all protocols above CORE.
32 * Set by us for CORE protocol.
34 int max_send = BUFFER_SIZE;
36 * Size of the data we can receive. Set by us.
37 * Can be modified by the max xmit parameter.
39 int max_recv = BUFFER_SIZE;
41 extern int last_message;
42 extern int global_oplock_break;
43 extern userdom_struct current_user_info;
44 extern int smb_read_error;
45 extern VOLATILE sig_atomic_t reload_after_sighup;
46 extern BOOL global_machine_password_needs_changing;
47 extern fstring global_myworkgroup;
48 extern pstring global_myname;
51 /****************************************************************************
52 structure to hold a linked list of queued messages.
54 ****************************************************************************/
60 } pending_message_list;
62 static ubi_slList smb_oplock_queue = { NULL, (ubi_slNodePtr)&smb_oplock_queue, 0};
64 /****************************************************************************
65 Function to push a message onto the tail of a linked list of smb messages ready
67 ****************************************************************************/
69 static BOOL push_message(ubi_slList *list_head, char *buf, int msg_len)
71 pending_message_list *msg = (pending_message_list *)
72 malloc(sizeof(pending_message_list));
76 DEBUG(0,("push_message: malloc fail (1)\n"));
80 msg->msg_buf = (char *)malloc(msg_len);
81 if(msg->msg_buf == NULL)
83 DEBUG(0,("push_message: malloc fail (2)\n"));
88 memcpy(msg->msg_buf, buf, msg_len);
89 msg->msg_len = msg_len;
91 ubi_slAddTail( list_head, msg);
96 /****************************************************************************
97 Function to push a smb message onto a linked list of local smb messages ready
99 ****************************************************************************/
101 BOOL push_oplock_pending_smb_message(char *buf, int msg_len)
103 return push_message(&smb_oplock_queue, buf, msg_len);
106 /****************************************************************************
107 do all async processing in here. This includes UDB oplock messages, kernel
108 oplock messages, change notify events etc.
109 ****************************************************************************/
110 static void async_processing(fd_set *fds, char *buffer, int buffer_len)
112 /* check for oplock messages (both UDP and kernel) */
113 if (receive_local_message(fds, buffer, buffer_len, 0)) {
114 process_local_message(buffer, buffer_len);
117 /* check for async change notify events */
118 process_pending_change_notify_queue(0);
120 /* check for sighup processing */
121 if (reload_after_sighup) {
122 change_to_root_user();
123 DEBUG(1,("Reloading services after SIGHUP\n"));
124 reload_services(False);
125 reload_after_sighup = False;
129 /****************************************************************************
130 Do a select on an two fd's - with timeout.
132 If a local udp message has been pushed onto the
133 queue (this can only happen during oplock break
134 processing) call async_processing()
136 If a pending smb message has been pushed onto the
137 queue (this can only happen during oplock break
138 processing) return this next.
140 If the first smbfd is ready then read an smb from it.
141 if the second (loopback UDP) fd is ready then read a message
142 from it and setup the buffer header to identify the length
144 Returns False on timeout or error.
147 The timeout is in milli seconds
148 ****************************************************************************/
150 static BOOL receive_message_or_smb(char *buffer, int buffer_len, int timeout)
162 * Note that this call must be before processing any SMB
163 * messages as we need to synchronously process any messages
164 * we may have sent to ourselves from the previous SMB.
169 * Check to see if we already have a message on the smb queue.
170 * If so - copy and return it.
172 if(ubi_slCount(&smb_oplock_queue) != 0) {
173 pending_message_list *msg = (pending_message_list *)ubi_slRemHead(&smb_oplock_queue);
174 memcpy(buffer, msg->msg_buf, MIN(buffer_len, msg->msg_len));
176 /* Free the message we just copied. */
177 SAFE_FREE(msg->msg_buf);
180 DEBUG(5,("receive_message_or_smb: returning queued smb message.\n"));
186 * Setup the select read fd set.
190 FD_SET(smbd_server_fd(),&fds);
191 maxfd = setup_oplock_select_set(&fds);
193 to.tv_sec = timeout / 1000;
194 to.tv_usec = (timeout % 1000) * 1000;
196 selrtn = sys_select(MAX(maxfd,smbd_server_fd())+1,&fds,timeout>0?&to:NULL);
198 /* if we get EINTR then maybe we have received an oplock
199 signal - treat this as select returning 1. This is ugly, but
200 is the best we can do until the oplock code knows more about
202 if (selrtn == -1 && errno == EINTR) {
203 async_processing(&fds, buffer, buffer_len);
205 * After async processing we must go and do the select again, as
206 * the state of the flag in fds for the server file descriptor is
207 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
214 /* something is wrong. Maybe the socket is dead? */
215 smb_read_error = READ_ERROR;
219 /* Did we timeout ? */
221 smb_read_error = READ_TIMEOUT;
226 * Ensure we process oplock break messages by preference.
227 * This is IMPORTANT ! Otherwise we can starve other processes
228 * sending us an oplock break message. JRA.
231 if (oplock_message_waiting(&fds)) {
232 async_processing(&fds, buffer, buffer_len);
234 * After async processing we must go and do the select again, as
235 * the state of the flag in fds for the server file descriptor is
236 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
241 return receive_smb(smbd_server_fd(), buffer, 0);
244 /****************************************************************************
245 Get the next SMB packet, doing the local message processing automatically.
246 ****************************************************************************/
248 BOOL receive_next_smb(char *inbuf, int bufsize, int timeout)
254 ret = receive_message_or_smb(inbuf,bufsize,timeout);
256 got_keepalive = (ret && (CVAL(inbuf,0) == SMBkeepalive));
257 } while (ret && got_keepalive);
262 /****************************************************************************
263 We're terminating and have closed all our files/connections etc.
264 If there are any pending local messages we need to respond to them
265 before termination so that other smbds don't think we just died whilst
267 ****************************************************************************/
269 void respond_to_all_remaining_local_messages(void)
275 * Assert we have no exclusive open oplocks.
278 if(get_number_of_exclusive_open_oplocks()) {
279 DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
280 get_number_of_exclusive_open_oplocks() ));
285 * Setup the select read fd set.
289 if(!setup_oplock_select_set(&fds))
293 * Keep doing receive_local_message with a 1 ms timeout until
294 * we have no more messages.
296 while(receive_local_message(&fds, buffer, sizeof(buffer), 1)) {
297 /* Deal with oplock break requests from other smbd's. */
298 process_local_message(buffer, sizeof(buffer));
301 (void)setup_oplock_select_set(&fds);
309 These flags determine some of the permissions required to do an operation
311 Note that I don't set NEED_WRITE on some write operations because they
312 are used by some brain-dead clients when printing, and I don't want to
313 force write permissions on print services.
315 #define AS_USER (1<<0)
316 #define NEED_WRITE (1<<1)
317 #define TIME_INIT (1<<2)
318 #define CAN_IPC (1<<3)
319 #define AS_GUEST (1<<5)
320 #define QUEUE_IN_OPLOCK (1<<6)
323 define a list of possible SMB messages and their corresponding
324 functions. Any message that has a NULL function is unimplemented -
325 please feel free to contribute implementations!
327 static struct smb_message_struct
330 int (*fn)(connection_struct *conn, char *, char *, int, int);
333 smb_messages[256] = {
335 /* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE},
336 /* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE},
337 /* 0x02 */ { "SMBopen",reply_open,AS_USER | QUEUE_IN_OPLOCK },
338 /* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
339 /* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC },
340 /* 0x05 */ { "SMBflush",reply_flush,AS_USER},
341 /* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
342 /* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK},
343 /* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
344 /* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE},
345 /* 0x0a */ { "SMBread",reply_read,AS_USER},
346 /* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC },
347 /* 0x0c */ { "SMBlock",reply_lock,AS_USER},
348 /* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
349 /* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER | QUEUE_IN_OPLOCK },
350 /* 0x0f */ { "SMBmknew",reply_mknew,AS_USER},
351 /* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
352 /* 0x11 */ { "SMBexit",reply_exit,0},
353 /* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
354 /* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
355 /* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
356 /* 0x15 */ { NULL, NULL, 0 },
357 /* 0x16 */ { NULL, NULL, 0 },
358 /* 0x17 */ { NULL, NULL, 0 },
359 /* 0x18 */ { NULL, NULL, 0 },
360 /* 0x19 */ { NULL, NULL, 0 },
361 /* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
362 /* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
363 /* 0x1c */ { "SMBreadBs",NULL,0 },
364 /* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
365 /* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
366 /* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
367 /* 0x20 */ { "SMBwritec",NULL,0},
368 /* 0x21 */ { NULL, NULL, 0 },
369 /* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE },
370 /* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER },
371 /* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER },
372 /* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
373 /* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC},
374 /* 0x27 */ { "SMBioctl",reply_ioctl,0},
375 /* 0x28 */ { "SMBioctls",NULL,AS_USER},
376 /* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
377 /* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE | QUEUE_IN_OPLOCK },
378 /* 0x2b */ { "SMBecho",reply_echo,0},
379 /* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
380 /* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
381 /* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC },
382 /* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC },
383 /* 0x30 */ { NULL, NULL, 0 },
384 /* 0x31 */ { NULL, NULL, 0 },
385 /* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | QUEUE_IN_OPLOCK | CAN_IPC },
386 /* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
387 /* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
388 /* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
389 /* 0x36 */ { NULL, NULL, 0 },
390 /* 0x37 */ { NULL, NULL, 0 },
391 /* 0x38 */ { NULL, NULL, 0 },
392 /* 0x39 */ { NULL, NULL, 0 },
393 /* 0x3a */ { NULL, NULL, 0 },
394 /* 0x3b */ { NULL, NULL, 0 },
395 /* 0x3c */ { NULL, NULL, 0 },
396 /* 0x3d */ { NULL, NULL, 0 },
397 /* 0x3e */ { NULL, NULL, 0 },
398 /* 0x3f */ { NULL, NULL, 0 },
399 /* 0x40 */ { NULL, NULL, 0 },
400 /* 0x41 */ { NULL, NULL, 0 },
401 /* 0x42 */ { NULL, NULL, 0 },
402 /* 0x43 */ { NULL, NULL, 0 },
403 /* 0x44 */ { NULL, NULL, 0 },
404 /* 0x45 */ { NULL, NULL, 0 },
405 /* 0x46 */ { NULL, NULL, 0 },
406 /* 0x47 */ { NULL, NULL, 0 },
407 /* 0x48 */ { NULL, NULL, 0 },
408 /* 0x49 */ { NULL, NULL, 0 },
409 /* 0x4a */ { NULL, NULL, 0 },
410 /* 0x4b */ { NULL, NULL, 0 },
411 /* 0x4c */ { NULL, NULL, 0 },
412 /* 0x4d */ { NULL, NULL, 0 },
413 /* 0x4e */ { NULL, NULL, 0 },
414 /* 0x4f */ { NULL, NULL, 0 },
415 /* 0x50 */ { NULL, NULL, 0 },
416 /* 0x51 */ { NULL, NULL, 0 },
417 /* 0x52 */ { NULL, NULL, 0 },
418 /* 0x53 */ { NULL, NULL, 0 },
419 /* 0x54 */ { NULL, NULL, 0 },
420 /* 0x55 */ { NULL, NULL, 0 },
421 /* 0x56 */ { NULL, NULL, 0 },
422 /* 0x57 */ { NULL, NULL, 0 },
423 /* 0x58 */ { NULL, NULL, 0 },
424 /* 0x59 */ { NULL, NULL, 0 },
425 /* 0x5a */ { NULL, NULL, 0 },
426 /* 0x5b */ { NULL, NULL, 0 },
427 /* 0x5c */ { NULL, NULL, 0 },
428 /* 0x5d */ { NULL, NULL, 0 },
429 /* 0x5e */ { NULL, NULL, 0 },
430 /* 0x5f */ { NULL, NULL, 0 },
431 /* 0x60 */ { NULL, NULL, 0 },
432 /* 0x61 */ { NULL, NULL, 0 },
433 /* 0x62 */ { NULL, NULL, 0 },
434 /* 0x63 */ { NULL, NULL, 0 },
435 /* 0x64 */ { NULL, NULL, 0 },
436 /* 0x65 */ { NULL, NULL, 0 },
437 /* 0x66 */ { NULL, NULL, 0 },
438 /* 0x67 */ { NULL, NULL, 0 },
439 /* 0x68 */ { NULL, NULL, 0 },
440 /* 0x69 */ { NULL, NULL, 0 },
441 /* 0x6a */ { NULL, NULL, 0 },
442 /* 0x6b */ { NULL, NULL, 0 },
443 /* 0x6c */ { NULL, NULL, 0 },
444 /* 0x6d */ { NULL, NULL, 0 },
445 /* 0x6e */ { NULL, NULL, 0 },
446 /* 0x6f */ { NULL, NULL, 0 },
447 /* 0x70 */ { "SMBtcon",reply_tcon,0},
448 /* 0x71 */ { "SMBtdis",reply_tdis,0},
449 /* 0x72 */ { "SMBnegprot",reply_negprot,0},
450 /* 0x73 */ { "SMBsesssetupX",reply_sesssetup_and_X,0},
451 /* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
452 /* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
453 /* 0x76 */ { NULL, NULL, 0 },
454 /* 0x77 */ { NULL, NULL, 0 },
455 /* 0x78 */ { NULL, NULL, 0 },
456 /* 0x79 */ { NULL, NULL, 0 },
457 /* 0x7a */ { NULL, NULL, 0 },
458 /* 0x7b */ { NULL, NULL, 0 },
459 /* 0x7c */ { NULL, NULL, 0 },
460 /* 0x7d */ { NULL, NULL, 0 },
461 /* 0x7e */ { NULL, NULL, 0 },
462 /* 0x7f */ { NULL, NULL, 0 },
463 /* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
464 /* 0x81 */ { "SMBsearch",reply_search,AS_USER},
465 /* 0x82 */ { "SMBffirst",reply_search,AS_USER},
466 /* 0x83 */ { "SMBfunique",reply_search,AS_USER},
467 /* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
468 /* 0x85 */ { NULL, NULL, 0 },
469 /* 0x86 */ { NULL, NULL, 0 },
470 /* 0x87 */ { NULL, NULL, 0 },
471 /* 0x88 */ { NULL, NULL, 0 },
472 /* 0x89 */ { NULL, NULL, 0 },
473 /* 0x8a */ { NULL, NULL, 0 },
474 /* 0x8b */ { NULL, NULL, 0 },
475 /* 0x8c */ { NULL, NULL, 0 },
476 /* 0x8d */ { NULL, NULL, 0 },
477 /* 0x8e */ { NULL, NULL, 0 },
478 /* 0x8f */ { NULL, NULL, 0 },
479 /* 0x90 */ { NULL, NULL, 0 },
480 /* 0x91 */ { NULL, NULL, 0 },
481 /* 0x92 */ { NULL, NULL, 0 },
482 /* 0x93 */ { NULL, NULL, 0 },
483 /* 0x94 */ { NULL, NULL, 0 },
484 /* 0x95 */ { NULL, NULL, 0 },
485 /* 0x96 */ { NULL, NULL, 0 },
486 /* 0x97 */ { NULL, NULL, 0 },
487 /* 0x98 */ { NULL, NULL, 0 },
488 /* 0x99 */ { NULL, NULL, 0 },
489 /* 0x9a */ { NULL, NULL, 0 },
490 /* 0x9b */ { NULL, NULL, 0 },
491 /* 0x9c */ { NULL, NULL, 0 },
492 /* 0x9d */ { NULL, NULL, 0 },
493 /* 0x9e */ { NULL, NULL, 0 },
494 /* 0x9f */ { NULL, NULL, 0 },
495 /* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK},
496 /* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC },
497 /* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC | QUEUE_IN_OPLOCK },
498 /* 0xa3 */ { NULL, NULL, 0 },
499 /* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
500 /* 0xa5 */ { NULL, NULL, 0 },
501 /* 0xa6 */ { NULL, NULL, 0 },
502 /* 0xa7 */ { NULL, NULL, 0 },
503 /* 0xa8 */ { NULL, NULL, 0 },
504 /* 0xa9 */ { NULL, NULL, 0 },
505 /* 0xaa */ { NULL, NULL, 0 },
506 /* 0xab */ { NULL, NULL, 0 },
507 /* 0xac */ { NULL, NULL, 0 },
508 /* 0xad */ { NULL, NULL, 0 },
509 /* 0xae */ { NULL, NULL, 0 },
510 /* 0xaf */ { NULL, NULL, 0 },
511 /* 0xb0 */ { NULL, NULL, 0 },
512 /* 0xb1 */ { NULL, NULL, 0 },
513 /* 0xb2 */ { NULL, NULL, 0 },
514 /* 0xb3 */ { NULL, NULL, 0 },
515 /* 0xb4 */ { NULL, NULL, 0 },
516 /* 0xb5 */ { NULL, NULL, 0 },
517 /* 0xb6 */ { NULL, NULL, 0 },
518 /* 0xb7 */ { NULL, NULL, 0 },
519 /* 0xb8 */ { NULL, NULL, 0 },
520 /* 0xb9 */ { NULL, NULL, 0 },
521 /* 0xba */ { NULL, NULL, 0 },
522 /* 0xbb */ { NULL, NULL, 0 },
523 /* 0xbc */ { NULL, NULL, 0 },
524 /* 0xbd */ { NULL, NULL, 0 },
525 /* 0xbe */ { NULL, NULL, 0 },
526 /* 0xbf */ { NULL, NULL, 0 },
527 /* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER | QUEUE_IN_OPLOCK },
528 /* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
529 /* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
530 /* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
531 /* 0xc4 */ { NULL, NULL, 0 },
532 /* 0xc5 */ { NULL, NULL, 0 },
533 /* 0xc6 */ { NULL, NULL, 0 },
534 /* 0xc7 */ { NULL, NULL, 0 },
535 /* 0xc8 */ { NULL, NULL, 0 },
536 /* 0xc9 */ { NULL, NULL, 0 },
537 /* 0xca */ { NULL, NULL, 0 },
538 /* 0xcb */ { NULL, NULL, 0 },
539 /* 0xcc */ { NULL, NULL, 0 },
540 /* 0xcd */ { NULL, NULL, 0 },
541 /* 0xce */ { NULL, NULL, 0 },
542 /* 0xcf */ { NULL, NULL, 0 },
543 /* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST},
544 /* 0xd1 */ { "SMBsendb",NULL,AS_GUEST},
545 /* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST},
546 /* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST},
547 /* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST},
548 /* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST},
549 /* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST},
550 /* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST},
551 /* 0xd8 */ { NULL, NULL, 0 },
552 /* 0xd9 */ { NULL, NULL, 0 },
553 /* 0xda */ { NULL, NULL, 0 },
554 /* 0xdb */ { NULL, NULL, 0 },
555 /* 0xdc */ { NULL, NULL, 0 },
556 /* 0xdd */ { NULL, NULL, 0 },
557 /* 0xde */ { NULL, NULL, 0 },
558 /* 0xdf */ { NULL, NULL, 0 },
559 /* 0xe0 */ { NULL, NULL, 0 },
560 /* 0xe1 */ { NULL, NULL, 0 },
561 /* 0xe2 */ { NULL, NULL, 0 },
562 /* 0xe3 */ { NULL, NULL, 0 },
563 /* 0xe4 */ { NULL, NULL, 0 },
564 /* 0xe5 */ { NULL, NULL, 0 },
565 /* 0xe6 */ { NULL, NULL, 0 },
566 /* 0xe7 */ { NULL, NULL, 0 },
567 /* 0xe8 */ { NULL, NULL, 0 },
568 /* 0xe9 */ { NULL, NULL, 0 },
569 /* 0xea */ { NULL, NULL, 0 },
570 /* 0xeb */ { NULL, NULL, 0 },
571 /* 0xec */ { NULL, NULL, 0 },
572 /* 0xed */ { NULL, NULL, 0 },
573 /* 0xee */ { NULL, NULL, 0 },
574 /* 0xef */ { NULL, NULL, 0 },
575 /* 0xf0 */ { NULL, NULL, 0 },
576 /* 0xf1 */ { NULL, NULL, 0 },
577 /* 0xf2 */ { NULL, NULL, 0 },
578 /* 0xf3 */ { NULL, NULL, 0 },
579 /* 0xf4 */ { NULL, NULL, 0 },
580 /* 0xf5 */ { NULL, NULL, 0 },
581 /* 0xf6 */ { NULL, NULL, 0 },
582 /* 0xf7 */ { NULL, NULL, 0 },
583 /* 0xf8 */ { NULL, NULL, 0 },
584 /* 0xf9 */ { NULL, NULL, 0 },
585 /* 0xfa */ { NULL, NULL, 0 },
586 /* 0xfb */ { NULL, NULL, 0 },
587 /* 0xfc */ { NULL, NULL, 0 },
588 /* 0xfd */ { NULL, NULL, 0 },
589 /* 0xfe */ { NULL, NULL, 0 },
590 /* 0xff */ { NULL, NULL, 0 }
594 /*******************************************************************
596 ********************************************************************/
597 static void smb_dump(char *name, int type, char *data, ssize_t len)
601 if (DEBUGLEVEL < 50) return;
603 if (len < 4) len = smb_len(data)+4;
604 for (i=1;i<100;i++) {
605 slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
606 type ? "req" : "resp");
607 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
608 if (fd != -1 || errno != EEXIST) break;
611 ssize_t ret = write(fd, data, len);
613 DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
615 DEBUG(0,("created %s len %d\n", fname, len));
620 /****************************************************************************
621 do a switch on the message type, and return the response size
622 ****************************************************************************/
623 static int switch_message(int type,char *inbuf,char *outbuf,int size,int bufsize)
625 static pid_t pid= (pid_t)-1;
627 extern uint16 global_smbpid;
631 if (pid == (pid_t)-1)
637 /* make sure this is an SMB packet */
638 if (strncmp(smb_base(inbuf),"\377SMB",4) != 0)
640 DEBUG(2,("Non-SMB packet of length %d\n",smb_len(inbuf)));
644 /* yuck! this is an interim measure before we get rid of our
645 current inbuf/outbuf system */
646 global_smbpid = SVAL(inbuf,smb_pid);
648 if (smb_messages[type].fn == NULL)
650 DEBUG(0,("Unknown message type %d!\n",type));
651 smb_dump("Unknown", 1, inbuf, size);
652 outsize = reply_unknown(inbuf,outbuf);
656 int flags = smb_messages[type].flags;
657 static uint16 last_session_tag = UID_FIELD_INVALID;
658 /* In share mode security we must ignore the vuid. */
659 uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
660 connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
662 DEBUG(3,("switch message %s (pid %d)\n",smb_fn_name(type),(int)pid));
664 smb_dump(smb_fn_name(type), 1, inbuf, size);
665 if(global_oplock_break)
667 if(flags & QUEUE_IN_OPLOCK)
670 * Queue this message as we are the process of an oplock break.
673 DEBUG( 2, ( "switch_message: queueing message due to being in " ) );
674 DEBUGADD( 2, ( "oplock break state.\n" ) );
676 push_oplock_pending_smb_message( inbuf, size );
681 /* Ensure this value is replaced in the incoming packet. */
682 SSVAL(inbuf,smb_uid,session_tag);
685 * Ensure the correct username is in current_user_info.
686 * This is a really ugly bugfix for problems with
687 * multiple session_setup_and_X's being done and
688 * allowing %U and %G substitutions to work correctly.
689 * There is a reason this code is done here, don't
690 * move it unless you know what you're doing... :-).
694 if (session_tag != last_session_tag) {
695 user_struct *vuser = NULL;
697 last_session_tag = session_tag;
698 if(session_tag != UID_FIELD_INVALID)
699 vuser = get_valid_user_struct(session_tag);
701 current_user_info = vuser->user;
704 /* does this protocol need to be run as root? */
705 if (!(flags & AS_USER))
706 change_to_root_user();
708 /* does this protocol need a valid tree connection? */
709 if ((flags & AS_USER) && !conn) {
710 return ERROR_DOS(ERRSRV, ERRinvnid);
714 /* does this protocol need to be run as the connected user? */
715 if ((flags & AS_USER) && !change_to_user(conn,session_tag)) {
716 if (flags & AS_GUEST)
719 return(ERROR_DOS(ERRSRV,ERRaccess));
722 /* this code is to work around a bug is MS client 3 without
723 introducing a security hole - it needs to be able to do
724 print queue checks as guest if it isn't logged in properly */
728 /* does it need write permission? */
729 if ((flags & NEED_WRITE) && !CAN_WRITE(conn))
730 return(ERROR_DOS(ERRSRV,ERRaccess));
732 /* ipc services are limited */
733 if (IS_IPC(conn) && (flags & AS_USER) && !(flags & CAN_IPC)) {
734 return(ERROR_DOS(ERRSRV,ERRaccess));
737 /* load service specific parameters */
738 if (conn && !set_current_service(conn,(flags & AS_USER)?True:False)) {
739 return(ERROR_DOS(ERRSRV,ERRaccess));
742 /* does this protocol need to be run as guest? */
743 if ((flags & AS_GUEST) &&
744 (!change_to_guest() ||
745 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
746 return(ERROR_DOS(ERRSRV,ERRaccess));
751 outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
754 smb_dump(smb_fn_name(type), 0, outbuf, outsize);
760 /****************************************************************************
761 construct a reply to the incoming packet
762 ****************************************************************************/
763 static int construct_reply(char *inbuf,char *outbuf,int size,int bufsize)
765 int type = CVAL(inbuf,smb_com);
767 int msg_type = CVAL(inbuf,0);
769 GetTimeOfDay(&smb_last_time);
776 return(reply_special(inbuf,outbuf));
778 construct_reply_common(inbuf, outbuf);
780 outsize = switch_message(type,inbuf,outbuf,size,bufsize);
782 outsize += chain_size;
785 smb_setlen(outbuf,outsize - 4);
789 /****************************************************************************
790 Keep track of the number of running smbd's. This functionality is used to
791 'hard' limit Samba overhead on resource constrained systems.
792 ****************************************************************************/
793 static BOOL smbd_process_limit(void)
797 if (lp_max_smbd_processes()) {
799 /* Always add one to the smbd process count, as exit_server() always
803 total_smbds = 1; /* In case we need to create the entry. */
805 if (!conn_tdb_ctx()) {
806 DEBUG(0,("smbd_process_limit: max smbd processes parameter set with status parameter not \
807 set. Ignoring max smbd restriction.\n"));
811 if (tdb_change_int32_atomic(conn_tdb_ctx(), "INFO/total_smbds", &total_smbds, 1) == -1)
814 return total_smbds > lp_max_smbd_processes();
820 /****************************************************************************
821 process an smb from the client - split out from the process() code so
822 it can be used by the oplock break code.
823 ****************************************************************************/
824 void process_smb(char *inbuf, char *outbuf)
827 extern BOOL sslEnabled; /* don't use function for performance reasons */
828 static int sslConnected = 0;
829 #endif /* WITH_SSL */
830 static int trans_num;
831 int msg_type = CVAL(inbuf,0);
832 int32 len = smb_len(inbuf);
835 DO_PROFILE_INC(smb_count);
837 if (trans_num == 0) {
838 /* on the first packet, check the global hosts allow/ hosts
839 deny parameters before doing any parsing of the packet
840 passed to us by the client. This prevents attacks on our
841 parsing code from hosts not in the hosts allow list */
842 if (smbd_process_limit() ||
843 !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1))) {
844 /* send a negative session response "not listening on calling
846 static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
847 DEBUG( 1, ( "Connection denied from %s\n",
849 (void)send_smb(smbd_server_fd(),(char *)buf);
850 exit_server("connection denied");
854 DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
855 DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );
858 if(sslEnabled && !sslConnected){
859 sslConnected = sslutil_negotiate_ssl(smbd_server_fd(), msg_type);
860 if(sslConnected < 0){ /* an error occured */
861 exit_server("SSL negotiation failed");
862 }else if(sslConnected){
867 #endif /* WITH_SSL */
871 else if(msg_type == SMBkeepalive)
872 return; /* Keepalive packet. */
874 nread = construct_reply(inbuf,outbuf,nread,max_send);
878 if (CVAL(outbuf,0) == 0)
881 if (nread != smb_len(outbuf) + 4)
883 DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
884 nread, smb_len(outbuf)));
887 if (!send_smb(smbd_server_fd(),outbuf))
888 exit_server("process_smb: send_smb failed.");
895 /****************************************************************************
896 return a string containing the function name of a SMB command
897 ****************************************************************************/
898 char *smb_fn_name(int type)
900 static char *unknown_name = "SMBunknown";
902 if (smb_messages[type].name == NULL)
903 return(unknown_name);
905 return(smb_messages[type].name);
909 /****************************************************************************
910 Helper function for contruct_reply.
911 ****************************************************************************/
913 void construct_reply_common(char *inbuf,char *outbuf)
915 memset(outbuf,'\0',smb_size);
917 set_message(outbuf,0,0,True);
918 SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
920 memcpy(outbuf+4,inbuf+4,4);
921 SCVAL(outbuf,smb_rcls,SMB_SUCCESS);
922 SCVAL(outbuf,smb_reh,0);
923 SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES));
924 SSVAL(outbuf,smb_flg2,
925 (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
926 FLAGS2_LONG_PATH_COMPONENTS |
927 FLAGS2_32_BIT_ERROR_CODES | FLAGS2_EXTENDED_SECURITY);
929 SSVAL(outbuf,smb_err,SMB_SUCCESS);
930 SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
931 SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
932 SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
933 SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
936 /****************************************************************************
937 construct a chained reply and add it to the already made reply
938 **************************************************************************/
939 int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
941 static char *orig_inbuf;
942 static char *orig_outbuf;
943 int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
944 unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
945 char *inbuf2, *outbuf2;
947 char inbuf_saved[smb_wct];
948 char outbuf_saved[smb_wct];
949 int wct = CVAL(outbuf,smb_wct);
950 int outsize = smb_size + 2*wct + SVAL(outbuf,smb_vwv0+2*wct);
952 /* maybe its not chained */
953 if (smb_com2 == 0xFF) {
954 SCVAL(outbuf,smb_vwv0,0xFF);
958 if (chain_size == 0) {
959 /* this is the first part of the chain */
961 orig_outbuf = outbuf;
965 * The original Win95 redirector dies on a reply to
966 * a lockingX and read chain unless the chain reply is
967 * 4 byte aligned. JRA.
970 outsize = (outsize + 3) & ~3;
972 /* we need to tell the client where the next part of the reply will be */
973 SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
974 SCVAL(outbuf,smb_vwv0,smb_com2);
976 /* remember how much the caller added to the chain, only counting stuff
977 after the parameter words */
978 chain_size += outsize - smb_wct;
980 /* work out pointers into the original packets. The
981 headers on these need to be filled in */
982 inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
983 outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;
985 /* remember the original command type */
986 smb_com1 = CVAL(orig_inbuf,smb_com);
988 /* save the data which will be overwritten by the new headers */
989 memcpy(inbuf_saved,inbuf2,smb_wct);
990 memcpy(outbuf_saved,outbuf2,smb_wct);
992 /* give the new packet the same header as the last part of the SMB */
993 memmove(inbuf2,inbuf,smb_wct);
995 /* create the in buffer */
996 SCVAL(inbuf2,smb_com,smb_com2);
998 /* create the out buffer */
999 construct_reply_common(inbuf2, outbuf2);
1001 DEBUG(3,("Chained message\n"));
1004 /* process the request */
1005 outsize2 = switch_message(smb_com2,inbuf2,outbuf2,size-chain_size,
1006 bufsize-chain_size);
1008 /* copy the new reply and request headers over the old ones, but
1009 preserve the smb_com field */
1010 memmove(orig_outbuf,outbuf2,smb_wct);
1011 SCVAL(orig_outbuf,smb_com,smb_com1);
1013 /* restore the saved data, being careful not to overwrite any
1014 data from the reply header */
1015 memcpy(inbuf2,inbuf_saved,smb_wct);
1017 int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
1018 if (ofs < 0) ofs = 0;
1019 memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
1025 /****************************************************************************
1026 Setup the needed select timeout.
1027 ****************************************************************************/
1029 static int setup_select_timeout(void)
1035 * Increase the select timeout back to SMBD_SELECT_TIMEOUT if we
1036 * have removed any blocking locks. JRA.
1039 select_timeout = blocking_locks_pending() ? SMBD_SELECT_TIMEOUT_WITH_PENDING_LOCKS*1000 :
1040 SMBD_SELECT_TIMEOUT*1000;
1042 t = change_notify_timeout();
1043 if (t != -1) select_timeout = MIN(select_timeout, t*1000);
1045 return select_timeout;
1048 /****************************************************************************
1049 Check if services need reloading.
1050 ****************************************************************************/
1052 void check_reload(int t)
1054 static time_t last_smb_conf_reload_time = 0;
1056 if(last_smb_conf_reload_time == 0)
1057 last_smb_conf_reload_time = t;
1059 if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK))
1061 reload_services(True);
1062 reload_after_sighup = False;
1063 last_smb_conf_reload_time = t;
1067 /****************************************************************************
1068 Process any timeout housekeeping. Return False if the caller should exit.
1069 ****************************************************************************/
1071 static BOOL timeout_processing(int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
1073 static time_t last_keepalive_sent_time = 0;
1074 static time_t last_idle_closed_check = 0;
1076 BOOL allidle = True;
1077 extern int keepalive;
1079 if (smb_read_error == READ_EOF)
1081 DEBUG(3,("end of file from client\n"));
1085 if (smb_read_error == READ_ERROR)
1087 DEBUG(3,("receive_smb error (%s) exiting\n",
1092 *last_timeout_processing_time = t = time(NULL);
1094 if(last_keepalive_sent_time == 0)
1095 last_keepalive_sent_time = t;
1097 if(last_idle_closed_check == 0)
1098 last_idle_closed_check = t;
1100 /* become root again if waiting */
1101 change_to_root_user();
1103 /* check if we need to reload services */
1106 /* automatic timeout if all connections are closed */
1107 if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT)
1109 DEBUG( 2, ( "Closing idle connection\n" ) );
1113 last_idle_closed_check = t;
1115 if (keepalive && (t - last_keepalive_sent_time)>keepalive)
1117 extern struct auth_context *negprot_global_auth_context;
1118 if (!send_keepalive(smbd_server_fd())) {
1119 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1123 /* send a keepalive for a password server or the like.
1124 This is attached to the auth_info created in the
1126 if (negprot_global_auth_context
1127 && negprot_global_auth_context->challenge_set_method
1128 && negprot_global_auth_context->challenge_set_method->send_keepalive) {
1129 negprot_global_auth_context->challenge_set_method->send_keepalive
1130 (&negprot_global_auth_context->challenge_set_method->private_data);
1133 last_keepalive_sent_time = t;
1136 /* check for connection timeouts */
1137 allidle = conn_idle_all(t, deadtime);
1139 if (allidle && conn_num_open()>0) {
1140 DEBUG(2,("Closing idle connection 2.\n"));
1144 if(global_machine_password_needs_changing &&
1145 /* for ADS we need to do a regular ADS password change, not a domain
1147 lp_security() == SEC_DOMAIN)
1149 unsigned char trust_passwd_hash[16];
1151 pstring remote_machine_list;
1154 * We're in domain level security, and the code that
1155 * read the machine password flagged that the machine
1156 * password needs changing.
1160 * First, open the machine password file with an exclusive lock.
1163 if(!secrets_fetch_trust_account_password(global_myworkgroup, trust_passwd_hash, &lct)) {
1164 DEBUG(0,("process: unable to read the machine account password for \
1165 machine %s in domain %s.\n", global_myname, global_myworkgroup ));
1170 * Make sure someone else hasn't already done this.
1173 if(t < lct + lp_machine_password_timeout()) {
1174 global_machine_password_needs_changing = False;
1178 pstrcpy(remote_machine_list, lp_passwordserver());
1180 change_trust_account_password( global_myworkgroup, remote_machine_list);
1181 global_machine_password_needs_changing = False;
1185 * Check to see if we have any blocking locks
1186 * outstanding on the queue.
1188 process_blocking_lock_queue(t);
1191 * Check to see if we have any change notifies
1192 * outstanding on the queue.
1194 process_pending_change_notify_queue(t);
1197 * Now we are root, check if the log files need pruning.
1198 * Force a log file check.
1200 force_check_log_size();
1204 * Modify the select timeout depending upon
1205 * what we have remaining in our queues.
1208 *select_timeout = setup_select_timeout();
1213 /****************************************************************************
1214 process commands from the client
1215 ****************************************************************************/
1217 void smbd_process(void)
1219 extern int smb_echo_count;
1220 time_t last_timeout_processing_time = time(NULL);
1221 unsigned int num_smbs = 0;
1223 InBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1224 OutBuffer = (char *)malloc(BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN);
1225 if ((InBuffer == NULL) || (OutBuffer == NULL))
1228 max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);
1230 /* re-initialise the timezone */
1233 /* register our message handlers */
1234 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
1235 talloc_init_named("dummy!");
1238 int deadtime = lp_deadtime()*60;
1239 int select_timeout = setup_select_timeout();
1243 deadtime = DEFAULT_SMBD_TIMEOUT;
1247 /* free up temporary memory */
1249 main_loop_talloc_free();
1251 while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
1252 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1254 num_smbs = 0; /* Reset smb counter. */
1258 * Ensure we do timeout processing if the SMB we just got was
1259 * only an echo request. This allows us to set the select
1260 * timeout in 'receive_message_or_smb()' to any value we like
1261 * without worrying that the client will send echo requests
1262 * faster than the select timeout, thus starving out the
1263 * essential processing (change notify, blocking locks) that
1264 * the timeout code does. JRA.
1266 num_echos = smb_echo_count;
1268 process_smb(InBuffer, OutBuffer);
1270 if (smb_echo_count != num_echos) {
1271 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1273 num_smbs = 0; /* Reset smb counter. */
1279 * If we are getting smb requests in a constant stream
1280 * with no echos, make sure we attempt timeout processing
1281 * every select_timeout milliseconds - but only check for this
1282 * every 200 smb requests.
1285 if ((num_smbs % 200) == 0) {
1286 time_t new_check_time = time(NULL);
1287 if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
1288 if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
1290 num_smbs = 0; /* Reset smb counter. */
1291 last_timeout_processing_time = new_check_time; /* Reset time. */